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Jasmonates Improve Drought Tolerance of Hordeum vulgare L. After Biochar Treatment
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Jasmonates Improve Drought Tolerance of Hordeum vulgare L. After Biochar Treatment
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Journal Article
Jasmonates Improve Drought Tolerance of Hordeum vulgare L. After Biochar Treatment
2024
Overview
To investigate how and in what amounts biochar and methyl jasmonate can improve drought tolerance of barley. A two-year experimental study was conducted in a factorial randomized complete block design (n = 5) in the research greenhouse of Zanjan University, Iran, to investigate the possible effects of biochar and methyl jasmonate on some traits of winter barley under drought conditions. Two irrigation regimes, D
0
(full irrigation in soil field capacity as control) and D
1
(withholding irrigation immediately after flowering stage), three methyl jasmonate spray densities [0 (M
0
), 50 (M
50
), and 100 (M
100
) μM] and four levels of biochar in soil [0% (B
0
), 0.25% (B
0.25
), 0.5% (B
0.5
), 1% (B
1
) per soil weight] were used in this experiment. In this study, drought reduced two-year average leaf area (LA) by 96%, stomatal conductance (gs) by 84%, and photosynthetic water use efficiency (PWUE) by 64%. In addition, drought reduced chlorophyll-b by 1.5% and 81% and transpiration rate (Tr) by 2.5% and 78% in the first and second years, respectively. However, the application of biochar and methyl jasmonate improved all the traits studied in both D0 and D1 drought-treated plants. For most of the parameters studied, the optimal combination of biochar and methyl jasmonate that optimized water use efficiency and alleviated drought was 0.25% and 50 μM, respectively. The synergistic action of biochar and jasmonates improved the tolerance of barley to water stress.
